Trashing this year's NFL Draft quarterback class at the Scouting Combine is easy. Finding a diamond is the challenge.

Teams searching for a franchise quarterback are preparing to dig deep once the Combine starts; players began arriving Wednesday in Indianapolis. Turn on the tape, and many scouts will tell you they don't see any quarterback worthy of a top-10 pick. Just because the Kansas City Chiefs desperately need a quarterback doesn't mean they are desperately seeking Geno Smith, or any quarterback, with the No. 1 pick.

"I'd be stunned if the Chiefs take a quarterback with the No. 1 pick," Rich Gannon, a Sirius XM NFL analyst and former NFL MVP at quarterback, told Sporting News on Tuesday. "Absolutely stunned. I can't imagine it would happen. I just don't think there's a quarterback there that's worthy.''

All play the position differently, which led Gannon to offer this piece of advice to quarterbacks at the Combine. Be yourself, even if you've prepared by working with a quarterback coach. Gannon can relate to being a long-shot quarterback, a fourth-round pick in 1978.

"The Combine was so much different then, but some things haven't changed," Gannon said. "You've got to trust your instincts when you've been throwing the ball a certain way for a long time. Philip Rivers throws the ball differently than Aaron Rodgers. Tom Brady's got a different stroke than Tony Romo, yet they're all effective.

"It's like golf. Does Jim Furyk get with a guy who wants to change his swing three weeks before the Masters? It doesn't make any sense. You can work with a coach, but don't forget what got you there. That's really important."

Remember the knocks on Wilson heading into last year's Combine. He's too small. Career backup at best, and certainly not ready to start.

At this year's Combine, you have to dig deeper. Maybe five of the top seven QB prospects will never win big in the NFL. But will all of them be busts? That seems highly unlikely, no matter what you hear.

Teams might pass on quarterbacks at the top of the draft. But at some point, maybe early in the second round, expect a run on quarterbacks.

"This is a wide open chance for a quarterback to let people know a lot more about what they're all about, not just their workout, but their intelligence, their competitiveness, their leadership," Gannon said. "Somebody, whether it's Geno Smith, or Matt Barkley or Mike Glennon — somebody's going to move up. And once one goes, there's going to be a sense of urgency among teams that don't have one to get one."

"Nassib is an interesting kid," said NFL Network draft analyst Mike Mayock, who lists Smith, Barkley, Glennon, Nassib and Landry Jones as his top five quarterbacks in that order. "I think what's going to happen to him (Nassib) will be similar to Kirk Cousins a year ago or Andy Dalton two years ago. When the coaches get involved in the evaluation, they'll start to fall in love with this kid because of his work ethic and intelligence. He's going to start to quietly climb boards between now and the combine and the draft."

Here are two more intriguing quarterbacks who will be throwing this weekend — Florida State's EJ Manuel, whose stock rose after a strong Senior Bowl, and Glennon.

"They're two kids that I'd love to see come out and rip the ball this weekend," Mayock said.

"One quarterback off the radar that I'd like to mention is a kid from Duke, Sean Renfree. He's not going to throw because he's coming off a peck injury. I don't understand why he's not more highly rated. He does not have big-arm talent, but his anticipation and accuracy are outstanding. I think he's gong to be a fifth-round guy that's going to surprise people."

Unlike Andrew Luck and Robert Griffin III last year, none of this year's quarterbacks has been labeled can't miss. Smith was inconsistent. Barkley's shoulder isn't healthy enough to throw at the Combine, and he's coming off a disappointing senior season.

The key is identifying which, if any, of these quarterbacks can evolve from question marks into quality. Wilson did it as a rookie. Kaepernick did it in his second season, helping the 49ers reach the Super Bowl.

Both Wilson and Kaepernick turned out to be better than advertised, and the same will be true for some quarterbacks in this group. They have already been torn down. But this week, some of them will start to rise.